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From: John Woodgate
Newsgroups: sci.electronics.design
Subject: Re: volume control at speaker location
Date: Tue, 24 Sep 2002 22:14:18 +0100
Organization: JMWA Electronics Consultancy
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Reply-To: John Woodgate
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I read in sci.electronics.design that Benoit Provost
wrote (in )
about 'volume control at speaker location', on Tue, 24 Sep 2002:
> My sound system is in my living room, and I am installing speakers in the
>basement, wired to "Speakers B" on the amplifier. I would like to know if
>there is a simple (passive) way to adjust the volume at the speakers in the
>basement. The simplest way to do this is of course to put a potentiometer in
>series with the speaker, but this always gives a very non-linear control.
>F
Don't put it in series! And 500 ohms is too high a value. While you
can't get linear control, as you say, if you use a 20 ohm power cermet
pot **as a pot**, with an 8 ohm loudspeaker from cold end to slider,
that's about the best you can do. If you need better, you need a 2-pole
multi-way switch and a bunch of resistors, to make an L-pad. Calculating
the values is left as an exercise for the student. (;-) You need to have
steps of 2 dB for home listening, not closer or wider. And they DO need
to be in dB, to match you logarithmic hearing sensitivity.
--
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
Interested in professional sound reinforcement and distribution? Then go to
http://www.isce.org.uk
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